P289D

Cylinder 4 Ion Current Sense Circuit Range/Performance

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$17–89 (est.)

Symptoms

Unstable engine operation
Increased fuel consumption
Check Engine Light Illuminates
Reduced engine power
Possible misfires

Causes

Open or short circuit in the ion current circuit
Ion current sensor malfunction
Problems with the ignition coil
Engine control unit malfunction
Poor contact in circuit connectors

How to Fix

Check the integrity of the ion current circuit wiring
Check the condition of connectors and contacts
Test the ion current sensor
Check the ignition coil of the 4th cylinder
If necessary, replace faulty components

Related codes

P289C P289E P289F